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Finding the Third Proportional to 117.50 and 138.50

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Solution

The third proportional to 117.50 and 138.50 is: 163.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.50 : 138.50 = 138.50 : x
  2. Step 2: Convert to fraction form
    117.50/138.50 = 138.50/x
  3. Step 3: Cross multiply
    117.50x = 138.50 × 138.50
  4. Step 4: Simplify right side
    117.50x = 19,182.25
  5. Step 5: Solve for x
    x = 19,182.25/117.50
  6. Step 6: Final answer
    x = 163.25

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.